CBSE Class 12 Physics Board Question Paper 2014
This document contains the CBSE Class 12 Physics Previous Year Question Paper from 2014, focusing on the topic of Communication. It includes various questions, primarily short-answer type, designed to test students' understanding of fundamental concepts in communication systems. Questions cover topics such as the components of a communication system (transmitter, channel, receiver), signal attenuation, communication modes (point-to-point), the function of transducers and repeaters, and different propagation methods like sky wave, ground wave, and space wave. The paper aims to help students prepare for their board examinations by familiarizing them with the types of questions asked and the expected depth of knowledge. Solving previous year papers is crucial for understanding exam patterns and improving performance.
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Quick info
| Board | CBSE |
|---|---|
| Class | 12 |
| Subject | Physics |
| Session | 2014 |
| Language | English |
| Type | Previous Year Question Paper |
| Exam type | Board Exam |
Paper pattern
The paper consists of short-answer questions testing fundamental concepts in communication systems.
Topics covered
Paper topics
- Communication systems
- Signal propagation
- Transducers
- Repeaters
- Attenuation
- Sky wave propagation
- Ground wave propagation
- Space wave propagation
Important topics
- Block diagram of a generalised communication system
- Attenuation in communication systems
- Point-to-point communication
- Function of a transducer
- Function of a repeater
- Types of wave propagation (Sky wave, Ground wave, Space wave)
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Question paper text
Communication
1 Mark Questions
- The figure given below shows the block diagram of a generalised communication system.
Identify the element labelled X and write its function. [Delhi 2014 C]
Χ User
Information Transmitter Receiver source <sup>L</sup>Message Message signal signal
Ans. Labelled element X represents the channel. Its function is to transmit information from one place to another.
- What is the meaning of the term attenuation used in communication system? [All India 2014C]
Ans. It refers to the loss of strength of a signal during its propagation through the communication channel output.
- Give the one example of point-to-point communication mode. [All India 2014C]
Ans. Telephone is the example of point-to-point communication mode.
- What is the function of a transducer used in a communication system? [Delhi 2012]
Ans. Transducer used as a sensor or detector in communication system. It converts the physical signal into electrical signal.
- What does the term attenuation used in communication system mean? [Delhi 2012, 2008C]
Ans. It refers to the loss of strength of a signal during its propagation through the communication channel output.
- What is the function of a repeater in a communication system? [Foreign 2011; Delhi 2010]
Ans. Repeater It picks up the signals from the transmitter, amplifies it and transmit it to the receiver. Thus, repeater comprises up of receiver, transmitter and amplifier. Its function is to extend the range of communication
- What is the function of a transmitter in a communication system? [Foreign 2011]
Ans. Transmitter It comprises of message signal source, modulator and transmitting antenna. Transmitter make signals compatible for communication channel via modulator and antenna.
8. How are microwaves produced? [Foreign 2011]
Ans. A type of electromagnetic wave is microwave whose wavelength ranging from as long as meter to as short as millimeter and having the frequency range 3000 MHz to 300 GHz. This also includes UHF, EHF and various sources with different boundaries.
9. What is the sky wave propagation? [Delhi 2009]
Ans. Sky wave propagation When radio wave propagates from one place of earth to other after reflection by ionosphere, the range of frequencies from few MHz to 30 MHz gets reflected back by ionosphere. This range also reflected as short wave band. This mode of propagation is used by short wave broadcast service.
10. What is ground wave propagation? [Delhi 2009]
Ans. Ground wave propagation The radio waves whose frequencies ranged up to 1500 kHz, propagates from one place of earth to other following its transmission along the surface of earth. These waves get attenuated and hence cannot travel over long distances. This range of frequencies also referred as amplitude modulated band (AM band).
11. What is space wave propagation? [Delhi 2009]
Ans. Space wave propagation It is also known as Line of Sight propagation (LOS). The radio wave transmitted by antenna directly reaches the receiving antenna travelling along a straight
Frequently asked questions
What is this document?
This is a CBSE Class 12 Physics Previous Year Board Question Paper from 2014, focusing on the topic of Communication.
What is the main topic covered?
The paper primarily covers concepts related to communication systems, including their components, signal properties, and propagation methods.
How can solving this paper help students?
Solving this previous year question paper helps students understand the exam pattern, identify important topics, and practice answering questions relevant to the CBSE board exams.
What types of questions are included?
The paper includes short-answer questions that test the understanding of definitions, functions, and examples related to communication systems.
What is the benefit of practicing with previous year papers?
Practicing with previous year question papers is an effective way to prepare for board exams, improve time management, and boost confidence by familiarizing oneself with the actual exam format.
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